ZnAl类水滑石吸附Cr(VI)性能研究

Studies on adsorption of Cr ( VI ) from aqueous solutions onto Zn/Al -layered double hydroxides

对影响ZnAl-LDO吸附Cr(VI)性能的各因素(溶液pH值、温度、搅拌和沉降时间、初始Cr(VI)浓度、Zn/Al比)进行探讨,并考察了材料再生后的吸附性能.研究结果表明,控制溶液pH值是提高ZnAl-LDO吸附Cr(VI)性能的关键点;在最佳吸附条件下,Zn2Al-LDO对Cr(VI)的饱和吸附量高达73.83mg/g;吸附材料可再生,循环使用3次,吸附性能无明显变化.

<Abstrcat> The performances of ZnAl-LDO for adsorption and desorption of hexavalent chromium was investigated. The influence of stir and subside time, solution pH, initial chromium concentration and temperature, the ratio Zn/Al has been tested. The results indicated that strictly controlling solution pH in the reaction was the key of enhanceing adsorption. Under the best adsorption conditions, the adsorption capacity of Zn_2Al-LDO reached 73.83 mg/g. Materials can reuse through desorption in the sodium carbonate solution,and the adsorption efficient had not changed markedly after three cycles.